21310231304 has 8 divisors (see below), whose sum is σ = 39956683710. Its totient is φ = 10655115648.

The previous prime is 21310231303. The next prime is 21310231333. The reversal of 21310231304 is 40313201312.

It can be written as a sum of positive squares in only one way, i.e., 12859106404 + 8451124900 = 113398^2 + 91930^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21310231301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1331889449 + ... + 1331889464.

Almost surely, 2^21310231304 is an apocalyptic number.

It is an amenable number.

21310231304 is a deficient number, since it is larger than the sum of its proper divisors (18646452406).

21310231304 is a wasteful number, since it uses less digits than its factorization.

21310231304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663778919 (or 2663778915 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21310231304 its reverse (40313201312), we get a palindrome (61623432616).

The spelling of 21310231304 in words is "twenty-one billion, three hundred ten million, two hundred thirty-one thousand, three hundred four".